diff --git a/proto/gz/msgs/gui_camera.proto b/proto/gz/msgs/gui_camera.proto
index 96cfa121..d851d2dc 100644
--- a/proto/gz/msgs/gui_camera.proto
+++ b/proto/gz/msgs/gui_camera.proto
@@ -40,4 +40,6 @@ message GUICamera
 
   /// \brief Type of projection: "perspective" or "orthographic".
   string projection_type       = 6;
+  /// \brief The duration in seconds of the camera motion to the new camera pose.
+  double duration               = 7;
 }